Orbital Extension of a Giant Ethmoidal Sinus Osteoma in a ۳۰-Year-old Female

Introduction: Osteoma is a benign tumor rarely found in the paranasal sinuses.   Case Report: A ۳۰-year-old female presented with an ۸-month history of proptosis of the right eye that was progressing slowly. She was diagnosed with ethmoid osteoma and managed with collaborative surgery at the ophthalmology and otolaryngology departments. After surgery, the patient suffered visual loss that was managed medically. The surgical steps and protocol used for safe removal are discussed in the report.    Conclusion: Management of a giaint osteoma extending to orbital tissue needs meticulous dissection through open approach and collaborative surgery by otolaryngologist and ophtalmologist